Thanks for sharing. I've been charging to 90% SOC daily per the SC's recommendation. My 90% range is now up to 138RM from 130RM over a month ago. I brought my car to the SC today. I was told that my battery checked out fine, I should continue to charge to 90%, and that's that. The official word is as follows:
"Engineering evaluated this concern and concluded that this is a normal behavior of the range calculation when the battery has been charged to a lower SOC for a prolonged period of time. It is suggested that the customer charge the vehicle to 90% SOC (Daily use). We recognize the inconvenience and negative user experience associated with this incorrect and reduced range estimate, and we are developing more accurate estimation algorithms which will be pushed over the air to the car when available."
So, Tesla is saying it's my fault for charging to a lower SOC. On the plus side, the SC reps were very polite throughout this process, and a Tesla Ownership Experience rep called me to check on me and to tell me that an engineer said my degradation was normal.
@ckessel, congrats on having your battery issue addressed!